Obsidian Rock – Meaning, Uses, Facts, Properties & Color
We know three main classes of rocks, sedimentary, igneous, and metamorphic. In the Limestone article, we learned how sedimentation occurs and the formation of sedimentary rocks takes place. Today, we are going to know Obsidian rock, which falls in the main class of igneous rocks. We know igneous rocks have two basic types: 1. Intrusive Igneous Rocks When molten lava/magma is cooling slowly below the surface of the earth and forms large crystals in the rocks, they are known as intrusive igneous rocks . For example- Diorite Gabbro Granite Pegmatite Peridotite 2. Extrusive Igneous Rocks When molten magma is cooling rapidly onto the surface of the earth and forms small crystals in the rocks, they are known as extrusive igneous rocks. For example- Obsidian Andesite Basalt Dacite Pumice Rhyolite Scoria Tuff Fire Opal What Is Obsidian Rock? Obsidian is a glassy igneous rock that comes in a wide range of colours and t...